ubifs: fix sort function prototype

The global sort() function expects a callback pointer to a function with two
void* arguments, but ubifs has a function with specific object types, which
causes a warning in clang-16 and higher:

fs/ubifs/lprops.c:1272:9: error: cast from 'int (*)(struct ubifs_info *, const struct ubifs_lprops *, int, struct ubifs_lp_stats *)' to 'ubifs_lpt_scan_callback' (aka 'int (*)(struct ubifs_info *, const struct ubifs_lprops *, int, void *)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
 1272 |                                     (ubifs_lpt_scan_callback)scan_check_cb,
      |                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Change the prototype to the regular one and cast the object pointers
locally instead.

Fixes: 1e51764a ("UBIFS: add new flash file system")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/find.c

@@ -726,11 +726,10 @@ int ubifs_find_free_leb_for_idx(struct ubifs_info *c)
 	return err;
 }
 
-static int cmp_dirty_idx(const struct ubifs_lprops **a,
-			 const struct ubifs_lprops **b)
+static int cmp_dirty_idx(const void *a, const void *b)
 {
-	const struct ubifs_lprops *lpa = *a;
-	const struct ubifs_lprops *lpb = *b;
+	const struct ubifs_lprops *lpa = *(const struct ubifs_lprops **)a;
+	const struct ubifs_lprops *lpb = *(const struct ubifs_lprops **)b;
 
 	return lpa->dirty + lpa->free - lpb->dirty - lpb->free;
 }
@@ -754,7 +753,7 @@ int ubifs_save_dirty_idx_lnums(struct ubifs_info *c)
 	       sizeof(void *) * c->dirty_idx.cnt);
 	/* Sort it so that the dirtiest is now at the end */
 	sort(c->dirty_idx.arr, c->dirty_idx.cnt, sizeof(void *),
-	     (int (*)(const void *, const void *))cmp_dirty_idx, NULL);
+	     cmp_dirty_idx, NULL);
 	dbg_find("found %d dirty index LEBs", c->dirty_idx.cnt);
 	if (c->dirty_idx.cnt)
 		dbg_find("dirtiest index LEB is %d with dirty %d and free %d",